Number of second differences of arrays of length 5 of numbers in 0..n.

Terms

a(0) =31a(1) =199a(2) =625a(3) =1429a(4) =2731a(5) =4651a(6) =7309a(7) =10825a(8) =15319a(9) =20911a(10) =27721a(11) =35869a(12) =45475a(13) =56659a(14) =69541a(15) =84241a(16) =100879a(17) =119575a(18) =140449a(19) =163621a(20) =189211a(21) =217339a(22) =248125a(23) =281689a(24) =318151a(25) =357631a(26) =400249a(27) =446125a(28) =495379a(29) =548131